Antenna



FIG. 1 is a perspective view of an antenna, showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a side elevational view thereof; and,

FIG. 5 is an enlarged, fragmentary perspective view of the central portion of the antenna. 

CLAIM I claim the ornamental design for an antenna, as shown and described. 